Study On High-pressure Spray Atomization Performance Of 60KWe Micro Gas Turbine Combustion Chamber

As one of the alternative technologies to improve the cruising range of electric vehicles,the range extender technology with micro-turbine technology as the core and high-efficiency battery management technology has broad development prospects.The advantages and disadvantages of the atomization performance of the nozzle largely determine the pros and cons of the fuel blending combustion performance.In this paper,the application of the microturbine in the mobile vehicle is studied,and the atomization performance of the injector is studied.The matching of the micro gas turbine combustion chamber puts forward certain requirements.Firstly,this paper designed a set of injector atmospheric pressure atomization test bench,and recorded the spray field image with PIV particle imaging velocimetry system.After filtering and denoising the image by MATLAB,it was fitted according to least squares method.The atomization cone angle was obtained,and the droplet size information was obtained by IPP6.0 image processing software.The spray field velocity distribution was obtained by PIV self-contained post-processing system FlowMaster.Secondly,for the pressure-flow characteristic curve,spray field velocity distribution and droplet size characteristics,the test results are compared with the simulation results,and the following results are obtained: the pressure-flow curve is basically coincident under high pressure,and the maximum error is 8.15%;the spray field velocity distribution has a good fit at the main body area.The detailed analysis of the cause of the test deviation is given in the paper,and the mathematical correction of the deviation is made.The maximum axial velocity error is 9.76%.The maximum error of SMD at different planes is 3.97%.Based on the above results,it is considered that the test and simulation results have a high degree of matching,and the model can be used to simulate the actual spray field.Then,in this paper,the effects of parameters such as jet pressure difference,combustion chamber back pressure,combustion chamber air temperature,spray deflection angle and single hole atomization angle on the atomization performance are studied.The results show that the parameters are related to the droplets.The influence of the degree of fragmentation is essentially due to its influence on the Weber number.The specific behavior is that the change of jet pressure difference causes the jet velocity to change,and the relative flow velocity between gas and liquid changes,which has a great influence on the aerodynamic force.The change in pressure and combustion chamber air temperature causes a change in air density,which has a large impact on aerodynamic forces.The jet deflection angle and the single hole atomization angle have little effect on the atomization performance,but have a great influence on the atomization morphology.Therefore,the three quantities of injectionpressure difference,combustion chamber back pressure and combustion chamber air temperature can be used as the main parameters for regulating the atomization performance,and the spray deflection angle and the single hole atomization angle can be used as the main parameters for regulating the atomization shape.Finally,the two-stage cyclone of the micro gas turbine combustor head is modeled.The shape and atomization performance of the spray field affected by the swirl field are studied.The spray deflection angle and the single hole atomization angle are controlled.,gives the optimization results of the injector and combustion chamber configuration.For the combustion chamber working conditions,the optimal matching is: the spray deflection angle is 8~12°,the single hole atomization angle is10~16°,and the overall atomization cone angle is 30~36°.